Tag query event driven

Hello, when a tag query is configure with event driven it means that the query is fire when the event happen but which event ? When the tag is read? Could we configure this event?
Thank for help.

Event driven relies on a change to some other tag referenced in your query binding. So if your query takes an integer parameter and you tie that to another tag, a change to that integer tag will trigger your query again.

It work well. Thank.